Heated water is circulated along reinforced polythene piping with separate circuits for different rooms and areas. Each circuit is connected to a manifold with regulating valves and a thermostat so different rooms can be heated to different temperatures and at different times, minimising unnecessary energy use.
The manifolds distribute water at temperatures of 35-60ºC which in turn heats the floor to a comfortable constant between 18-29oC. When the room reaches a pre-set temperature the thermostat signals to a valve on the manifold to close the circuit in that room. There are three main types of wet underfloor heating: